Stop device for threading, rolling, and other machines



April 11, 1944. 1.. c. STEINLE ETAL 2,346,516

STOP DEVICE FOR THREADING, ROLLING AND OTHER MACHINES 2 Shets-Sheer. 1

Fi'ledApril 6, 1943 m m E z; 22, 22: z: E

April 1944- L. c. S TEINLE ETAL 2,346,516

STOP DEVICE FOR THREADING, ROLLING AND OTHER MACHINES Filed A p'ril 6, 1943 2 Sheets-Sheet 2 Lax/612K011) 17,6, SteazzZe j CHfiazm/e/L Patente d Apr. 11, 1944 UNITED STATES PATENT OFFilCE f STOP DEVICE FOR THREADI'NG, RGLL'ING,

AND. OTHER MACHINES Leo. Caspar Steinle, Wimbledon. London and Cedric Harold Hanwell, Cogenhoe, England Application April-6, 1943, Serial No. 482 064 In Great Britain March 25. 1942 7 Claims.

Th sinren ien relates. to thread machines; embottlin reciprocatingslides orthe, like whereasurate. limitation of, movement, i required. The invention is particularly applicable to. generating. machines embodying a. pair of roller. dies rotatable in they same direction and formed with screw threads, one roller die being mounted in stationary bearings and the. other being mounted so as. to be. shiftable together with a slide transversely to its axis and a rod being provided to limit to a predetermined adjustable extent the amount of said transverse movement; a machine of this nature is described in British specifica tion No. 516,233.

In such a machine it is important to ensure that the extent of the transverse movement shall be determined very accurately on every excursion of the movable axis roller die, and the object of the present invention is to provide means to that end.

The invention consists in a motion-limiting device including a fixed abutment surface, an adjustable stop head on a member and a rigid buffer ring inserted between said adjustable stop head and said fixed abutment surface, said buffer ring being domed, preferably spherically, on one face for engagement with a similarly shaped concave surface on said adjustable stop head, and being furnished with three projections on the opposite face for engaging said fixed abutment surface.

The invention also consists in a motion-limiting device as set forth in either of the two preceding paragraphs, wherein said adjustable stop head comprises a rotatable bolt or like head rigid with a screw-threaded rod and ring rotationally free but capable of being clamped in relation to said rod, said ring embodying means, e. g., peripheral dial markings, enabling its angular position in relation to the fixed abutment surface to be set as desired.

Referring to the accompanying diagrammatic drawings- I Figure 1 is a vertical longitudinal section of part of a thread rolling machine embodying the present invention in one form, and

Figure 2 is a sectional plan thereof.

In carrying the invention into effect in one convenient form illustrated by way of example in Figures 1 and 2 as applied to a thread rolling machine as illustrated in British specification No. 516,233, the screw bolt 34 carries beneath its head a a freely rotatable ring b of somewhat conical form, and embodying an end flange c; the narrower end of this ring abuts the head a of the screw bolt Whilit the other end of the ring is furnished with a concave surface d of spherical curvature. a

A helical spring 1 bears at one end against a washerm beneath the head a and at the other end bears against an abutment bush -g to be described below; thisspring serves to return. a slide it into the position shown in Figures 1 and 2.

A boss n on the bolt 34 is furnished with a peripheral groove 0 with which the end of a wing screw p engages to permit the ring being rotated relatively to the bolt 34 or locked rigidly thereto as desired. I

The flanged bush 9 is fitted in a rigid upright h on the machine and has an inner bor for reception of the screw bolt 34 that is flared at both end but a sliding fit on the screw bolt at the central portion of the bush.

The bush is an easy fit in the upright and the flange is recessed therein so as to lie flush. Between the flange of the abutment bush 9 and the aforesaid concave surface it is a floating ring 1' which on one face is furnished with a convex surface of spherical form corresponding with the convex curved surface d, and on it other face is furnished with three equidistantly spaced axial projections q. 7

Let into each projection q is a spring-urged plunger 1' to hold the ring 2 snugly pressed against the concave surface (I.

In operation, as the screw bolt 34 is drawn axially by the slide is carrying the moving axis roller die to the left as viewed in Figures 1 and. 2. the plunger r in the floating ring 2 are depressed until further movement is prevented by the projections q abutting the flange of the bush g.

The floating ring assembly i thus acts as a buffer ring which, owing to the geometric bearing provided by the three axial projections q, and owing to the opposed spherical face (1, centres itself with extreme precision on every excurslon of the screw bolt and accurately determines the forward movement of the screw bolt.

Furthermore, the arrestin force acts truly along the longitudinal axis of the screw bolt 34, and the latter is thus not subjected to any bendin couple.

When it is desired to vary the permitted transverse movement of the slide the screw p is slackened and the conical ring b is moved through an appropriate angle as shown-by dial markings c on the periphery of the flange c in conjunction with a fixed pointer c cooperating therewith.

The screw is then tightened and the'screw bolt head rotatedcarrying with it the conical memher with flange and dial markings-until the fixed pointer registers with the dial marking (say, zero) previously in register therewith. The angular lever a at the right end of the screw bolt 34 is threaded in the latter and is provided to enable a bar inserted in one of the openings a of said bolt to be secured in position while the bar is being used to rotate the bolt.

The result of these operations is to vary the effective length of the screw bolt b an amount corresponding with the angular displacement that was given to the flanged conical member b.

We claim:

1. A motion-limiting device including a fixed abutment surface, an adjustable stop head on a member and a rigid bufier ring inserted between said adjustable stop head and said fixed abutmentsurface, said buifer ring being domed, preferably spherically, on one face for engagement with a similarly shaped concave surface on said adjustable stop head, and being furnished with three projections on the opposite face for engaging said fixed abutment surface.

2. A motion-limiting device as claimed in claim 1 wherein said projections are equidistantly spaced around the face of said bufier ring.

3. A motion-limiting device as claimed in claim 1 wherein said adjustable stop head comprises a. rotatable bolt or like head rigid with a screwthreaded rod and ring rotationally free but capable of being clamped in relation to said rod, said ring embodying means, enabling its angular position in relation to the fixed abutment surface to be set as desired.

4. A motion-limiting device as claimed in claim 1 wherein said adjustable stop head comprises a rotatable bolt head rigid with a screw-threaded rod and a ring freely rotatable, and means for clamping said freely rotatable ring in relation to said rod, said ring embodying means enabling its angular position in relation to the fixed abutment surface to be set as desired.

5. A motion-limiting device as claimed in claim 1 wherein said fixed abutment surface is constituted by the outer face of a flanged bush through which the member carrying the adjustable stop head passes.

, 6. A motion-limiting device as claimed in claim 1 wherein said fixed abutment surface is constituted by the outer surface of a flanged bush through which the member carrying the adjustable stop head passes, said bush having a central bore flared at both ends.

7. A motion-limiting device as claimed in claim 1 applied to a thread rolling machine of thenature indicated above.

LEO CASPAR STEINLE. CEDRIC HAROLD HANWELL. 

